eCite Digital Repository

Technical Report. Variation in barometric pressure in Melbourne does not significantly affect the BTPS correction factor

Citation

Johns, DP and Hartley, MF and Burns, G and Thompson, BR, Technical Report. Variation in barometric pressure in Melbourne does not significantly affect the BTPS correction factor, Respirology, 9, (3) pp. 406-408. ISSN 1323-7799 (2004) [Refereed Article]

DOI: doi:10.1111/j.1440-1843.2004.00613.x

Abstract

The conventional BTPS (body temperature and pressure, saturated with water vapour) correction factor varies with ambient barometric pressure (P B) and many lung function laboratories measure PB daily. The aim was to investigate whether a fixed value for PB could replace daily measurements. PB was measured daily over a 12-month period. The highest and lowest values in Melbourne in the last century were also recorded from data published by the Bureau of Meteorology. Using these P B values, the BTPS factor was determined for a range of spirometer temperatures and compared to the BTPS factors obtained using a fixed ambient pressure of 101.3 kPa. The mean (SD) PB measured over the 12-month period was 102.2 kPa (0.64) with a range of 99.9-103.6 kPa. The level of disagreement between the BTPS factor calculated using a PB of 101.3 kPa instead of the measured value was greater at lower temperatures. Over the extremes of PB during the last century (98.0-104.3 kPa) the use of a standard pressure (101.3 kPa) produced an error in the BTPS factor of ≤0.16%. Daily variations in PB do not significantly affect the magnitude of the conventional BTPS correction factor and a fixed value, such as 101.3 kPa at sea level, can be used with little error.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Atmospheric Sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Johns, DP (Associate Professor David Johns)
ID Code:30747
Year Published:2004
Deposited By:Medicine (Discipline)
Deposited On:2004-08-01
Last Modified:2005-06-22
Downloads:0

Repository Staff Only: item control page